why am i getting error calling web service?

 
Hello all expert ppl...I am using web service....I have defined
namespace called web1 in .asmx file...when i catch exception in
javascript i get message there as  web1 is not defined...

can u plz tell me why i am getting this error?

my web.config file
<QUOTE>
 <configuration>
    <!--<system.net>
    <mailSettings>
      <smtp from="prasad_nk_21@yahoo.co.in">
        <network host="localhost" port="25" userName="prasad_nk_21@yahoo.co.in" password="sadhvwx"/>
      </smtp>
    </mailSettings>
  </system.net>-->
    <system.net><mailSettings>
             ...